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Table 1 Clinical characteristics, incidence of successful weaning and weaning failure, and the cause of acute respiratory failure in the training set, prospective-validation data set and in the total population

From: A new integrative weaning index of discontinuation from mechanical ventilation

Clinical characteristics Training set (n = 115) Prospective-validation set (n = 216) Total population (n = 331)
Age (years) 64.68 ± 16.77 63.95 ± 17.63 64.20 ± 17.32
Duration of MV (days) 9.80 ± 8.47 8.78 ± 7.17 9.14 ± 7.65
APACHE II 15.99 ± 5.80 16.02 ± 5.43 16.01 ± 5.55
Successful weaning, n (%) 94 (81.7) 183 (84.7) 277 (83.68)
Weaning failure, n (%) 21 (18.3) 33 (15.3) 54 (16.31)
Cause of ARF    
COPD, n (%) 33 (28.69) 65 (30.09) 98 (29.6)
Pneumonia, n (%) 25 (21.73) 43 (19.9) 68 (20.54)
Postoperative ARF, n (%) 23 (20) 40 (18.51) 63 (19.03)
Sepsis, n (%) 12 (10.43) 27 (12.5) 39 (11.78)
ARDS/ALI, n (%) 8 (6.95) 17 (7.87) 25 (7.55)
Miscellaneous, n (%) 6 (5.21) 11 (5.09) 17 (5.13)
Multiple trauma, without brain injury, n (%) 4 (3.47) 7 (3.24) 11 (3.32)
Acute pulmonary edema, n (%) 4 (3.47) 6 (2.77) 10 (3.02)
  1. ALI = acute lung injury; APACHE II = Acute Physiology and Chronic Health Evaluation; ARDS = cute respiratory distress syndrome; ARF = acute respiratory failure; COPD = chronic obstructive pulmonary disease; MV = mechanical ventilation.